SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Skyrmions II (joint session MA/KFM)
MA 17.9: Vortrag
Freitag, 1. Oktober 2021, 12:15–12:30, H5
Kinetic small-angle neutron scattering of skyrmion lattice order in chiral magnets — •Denis Mettus1, Alfonso Chacon1, Andreas Bauer1, Sebastian Mühlbauer2, Alla Bezvershenko3, Lukas Heinen3, Achim Rosch3, and Christian Pfleiderer1 — 1Physik-Department, Technische Universität München, D-85748 Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 3Institute for Theoretical Physics, Universität zu Köln, D-50937 Köln, Germany
Skyrmions are topologically non-trivial spin textures that attract great interest, offering a possible avenue towards novel spintronics applications, e.g. in skyrmion-based racetrack memory. A key feature that motivates this interest is related to the exceptionally efficient coupling of skyrmion lattice order to spin currents, notably spin-polarized charge currents and magnon currents as observed in MnSi, FeGe, and Cu2OSeO3. This raises the question of the microscopic mechanisms that control the pinning and the elasticity modulus of the skyrmion lattice, and how they depend on the topology, electronic structure, and disorder. In the following contribution, we report kinetic studies of skyrmion lattice order by means of Time-resolved Small Angle Neutron Scattering (TISANE). We compare the unpinning processes in different systems, such as Mn1−xFexSi where spin-transfer torques are dominated by spin-polarized charge currents and insulating material Cu2OSeO3 with the spin transfer torques being due to magnon currents.